kutaki | 53e5bb2398ff5857e45c9ebeb3fe9bfd0a8d6a4809321582739bba553b66879c

General

Target

Tax Payment Challan.exe
Size

795KB
MD5

17c53a651b72616b46ecb8f5215ed009
SHA1

c426cc3a5e333bafb8e0b0ed78515dc003da31c6
SHA256

bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4
SHA512

c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

Score

10^/10

kutaki keylogger stealer

Malware Config

Signatures

Kutaki
Information stealer and keylogger that hides inside legitimate Visual Basic applications.
stealer keylogger kutaki

Kutaki Executable 4 IoCs

resource	yara_rule
behavioral1/files/0x0007000000005c51-58.dat	family_kutaki
behavioral1/files/0x0007000000005c51-59.dat	family_kutaki
behavioral1/files/0x0007000000005c51-61.dat	family_kutaki
behavioral1/files/0x0007000000005c51-66.dat	family_kutaki

Executes dropped EXE 1 IoCs

pid	Process
1500	hyuder.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe	Tax Payment Challan.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe	Tax Payment Challan.exe

Loads dropped DLL 2 IoCs

pid	Process
1376	Tax Payment Challan.exe
1376	Tax Payment Challan.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	hyuder.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\Disk\Enum\0	hyuder.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3440072777-2118400376-1759599358-1000\Software\Microsoft\Internet Explorer\Main	hyuder.exe

Suspicious use of SetWindowsHookEx 6 IoCs

pid	Process
1376	Tax Payment Challan.exe
1376	Tax Payment Challan.exe
1376	Tax Payment Challan.exe
1500	hyuder.exe
1500	hyuder.exe
1500	hyuder.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1376 wrote to memory of 1224	1376	Tax Payment Challan.exe	27
PID 1376 wrote to memory of 1224	1376	Tax Payment Challan.exe	27
PID 1376 wrote to memory of 1224	1376	Tax Payment Challan.exe	27
PID 1376 wrote to memory of 1224	1376	Tax Payment Challan.exe	27
PID 1376 wrote to memory of 1500	1376	Tax Payment Challan.exe	29
PID 1376 wrote to memory of 1500	1376	Tax Payment Challan.exe	29
PID 1376 wrote to memory of 1500	1376	Tax Payment Challan.exe	29
PID 1376 wrote to memory of 1500	1376	Tax Payment Challan.exe	29

C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe
"C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
1⤵
- Drops startup file
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1376
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c C:\Users\Admin\AppData\Local\Temp\
  2⤵
  PID:1224
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe"
  2⤵
  - Executes dropped EXE
  - Maps connected drives based on registry
  - Modifies Internet Explorer settings
  - Suspicious use of SetWindowsHookEx
  PID:1500

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Filesize
795KB

MD5
17c53a651b72616b46ecb8f5215ed009

SHA1
c426cc3a5e333bafb8e0b0ed78515dc003da31c6

SHA256
bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4

SHA512
c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Filesize
795KB

MD5
17c53a651b72616b46ecb8f5215ed009

SHA1
c426cc3a5e333bafb8e0b0ed78515dc003da31c6

SHA256
bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4

SHA512
c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Filesize
795KB

MD5
17c53a651b72616b46ecb8f5215ed009

SHA1
c426cc3a5e333bafb8e0b0ed78515dc003da31c6

SHA256
bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4

SHA512
c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

Download Submit
\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\hyuder.exe

Filesize
795KB

MD5
17c53a651b72616b46ecb8f5215ed009

SHA1
c426cc3a5e333bafb8e0b0ed78515dc003da31c6

SHA256
bd83761e9710a92a9b0b60a85c87f5aa2a27d30a8cff821e65df95d323d5b3d4

SHA512
c2abab756d7351f819340857d1f500e7344838d28f744de6db39d5e3021b4382be3920b77985f057404f6b6206f09010f2bd0b2fcb61a944276145acf375c5c6

Download Submit
memory/1376-56-0x0000000074E11000-0x0000000074E13000-memory.dmp

Filesize
8KB

Download
memory/1500-65-0x0000000003511000-0x00000000043BD000-memory.dmp

Filesize
14.7MB

Download

Analysis

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